This will give you the flow rate measured in gallons per minute (gpm). Divide the gallon size of the bucket by the number of seconds it took for the bucket to be filled, then multiply by 60. For pitot tube measurements and calculations, the reference plane is taken to be at the height of the pitot tube measurements, so the equation for stagnation pressure becomes: Pstag P + V2, which can be rearranged to: V (2P/)1/2.The change in height between the two legs of the manometer. These feed two ports the first subject to total pressure due to the car moving through the air and the second subject to the static air pressure. A Pitot tube used to measure air velocity is connected to a U-tube manometer filled with water. There is an orifice at the tip and a ring of holes in the horizontal section of the tube. Be sure to time the flow using an accurate stopwatch. A Pitot static tube comprises an inverted-L shaped tube that is pointed in the direction of the car’s travel.Measure the flow of the well into a bucket. Hint:A pitot tube works on principle of bernoullis theorem basically we convert kinetic energy of flowing fluid into the pressure energy inside the pitot tube.The remaining two hydrants are opened to allow water to flow out as fast as possible. A pressure gauge is placed on one hydrant to record the static pressure this is hydrant #1.
In this manner, how do you perform a hydrant flow test?Ī fire hydrant flow test is performed for a specific area by using three fire hydrants.
CAUTION: Due to the force of the stream, the pitot gauge should be held firmly in order to avoid injury. Pitot Tube - All pitot tubes are checked for damage, alignment and that. The hole in the end of the blade should be pointed directly into the stream as shown. Monitoring of total particulates involved isokinetic sampling using the Apex. The manometer will then display velocity pressure which can be converted to velocity.Īlso Know, how do you use a pitot gauge? Firmly grasp the pitot gauge and insert the tip of the blade into the stream as specified in Step 2. Particulate Concentration (STP) mg/m3 14.2 50 Mass Emission (STP) kg/hr 0.36 - Stack Temperature oC 77 - Gas Velocity m/s 14.90 - Stack Volume Flow Rate (Actual) m3/hr 34131 - Stack Volume Flow Rate (STP) m3/hr 26685 - All results are reported at reference conditions of 273K, 101.3kPa, wet gas. The positive port of the manometer is connected to the total pressure port (Pt) and the negative to the static pressure port (Ps). The Pitot tube is inserted into the duct with the tip pointed toward the airflow.
Flush the residual hydrant to remove any sediment and attach a nozzle cap with a gauge to the hydrant's outlet.Īccordingly, how do you use a pitot tube to measure water flow?.Mark the hydrant measuring pressure as the 'residual' hydrant.Determine the location of your test by selecting a group of hydrants in the same vicinity.
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